/**
 * Copyright 2016 Yahoo Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.yahoo.pulsar.broker.service;

import java.io.File;

import com.yahoo.pulsar.broker.ServiceConfiguration;
import com.yahoo.pulsar.common.api.PulsarDecoder;
import com.yahoo.pulsar.common.api.PulsarLengthFieldFrameDecoder;

import io.netty.channel.ChannelInitializer;
import io.netty.channel.socket.SocketChannel;
import io.netty.handler.ssl.ClientAuth;
import io.netty.handler.ssl.SslContext;
import io.netty.handler.ssl.SslContextBuilder;
import io.netty.handler.ssl.util.InsecureTrustManagerFactory;

public class PulsarChannelInitializer extends ChannelInitializer<SocketChannel> {

    public static final String TLS_HANDLER = "tls";
    BrokerService brokerService;
    ServiceConfiguration serviceConfig;
    boolean enableTLS;

    /**
     *
     * @param brokerService
     */
    public PulsarChannelInitializer(BrokerService brokerService, ServiceConfiguration serviceConfig,
            boolean enableTLS) {
        super();
        this.brokerService = brokerService;
        this.serviceConfig = serviceConfig;
        this.enableTLS = enableTLS;
    }

    @Override
    protected void initChannel(SocketChannel ch) throws Exception {
        if (enableTLS) {
            File tlsCert = new File(serviceConfig.getTlsCertificateFilePath());
            File tlsKey = new File(serviceConfig.getTlsKeyFilePath());
            SslContextBuilder builder = SslContextBuilder.forServer(tlsCert, tlsKey);
            if (serviceConfig.isTlsAllowInsecureConnection()) {
                builder.trustManager(InsecureTrustManagerFactory.INSTANCE);
            } else {
                if (serviceConfig.getTlsTrustCertsFilePath().isEmpty()) {
                    // Use system default
                    builder.trustManager((File) null);
                } else {
                    File trustCertCollection = new File(serviceConfig.getTlsTrustCertsFilePath());
                    builder.trustManager(trustCertCollection);
                }
            }
            SslContext sslCtx = builder.clientAuth(ClientAuth.OPTIONAL).build();
            ch.pipeline().addLast(TLS_HANDLER, sslCtx.newHandler(ch.alloc()));
        }
        ch.pipeline().addLast("frameDecoder",
                new PulsarLengthFieldFrameDecoder(PulsarDecoder.MaxFrameSize, 0, 4, 0, 4));
        ch.pipeline().addLast("handler", new ServerCnx(brokerService));
    }
}
